GROSSE POINTE WOODS — Using a few simple and readily available components, small and potentially dangerous bombs, often referred to as "Works" or "Drano" bombs for the active ingredients used, are causing concern for police in Grosse Pointe Woods.

Police issued a statement Friday after two such bombs were detonated overnight. There were no injuries or property damage noted.

"Our department is investigating two plastic bottle bombs that were detonated overnight," the department said in a statement. "These exploding devices are made with a 2-liter bottle, aluminum foil, and an accelerant.

"Use caution if this type of device is discovered. Do not touch and contact the public safety department."

The bombs consist of a plastic container — often a 2-liter bottle — within which tin foil and a household chemical is mixed initiating a chemical reaction.

The bottle is capped and the reaction causes the production of heat and expanding gasses followed by an explosion.